import {
  AsyncRouterMap,
  ConstRouterMap
} from '@/router'

/**
 * 通过meta.role判断是否与当前用户权限匹配
 * @param roles
 * @param route
 */
function hasPermission(roles, route) {
    if (route.meta && route.meta.role) {
      return roles.some(role => route.meta.role.indexOf(role) >= 0)
    } else {
      return true
    }
  }
  
  /**
   * 递归过滤异步路由表，返回符合用户角色权限的路由表
   * @param asyncRouterMap
   * @param roles
   */
  function filterAsyncRouter(asyncRouterMap, roles) {
    const accessedRouters = asyncRouterMap.filter(route => {
      if (hasPermission(roles, route)) {
        if (route.children && route.children.length) {
          route.children = filterAsyncRouter(route.children, roles)
        }
        return true
      }
      return false
    })
    return accessedRouters
  }

const permission = {
    state: {
        routers: ConstRouterMap,
        addRouters:[]
    },
    mutations:{
        SET_ROUTERS:(state,routers)=>{
            state.addRouters = routers
            state.routers = ConstRouterMap.concat(routers)
        }
    },
    actions:{
        GenerateRoutes({commit},data){
            return new Promise(resolve=>{
                const {roles} = data
                let accessedRouters
                if(roles.indexOf('admin')>=0){
                    accessedRouters = AsyncRouterMap
                } else {
                    accessedRouters = filterAsyncRouter(AsyncRouterMap, roles)
                }
                commit('SET_ROUTERS',accessedRouters)
                resolve()
            })
        }
    }
}

export default permission